Fenwick was the son of Henry Fenwick and Jane Lutwidge Cookson, and entered the army in 1885.
He changed to a political career when he was elected as the Member of Parliament (MP) for Houghton-le-Spring at the 1892 general election, and held the seat until he stood down at the 1895 general election.
In 1899 he was again in active service, as 2nd in Command of the Royal Horse Guards. He served with the regiment during the Second Boer War in South Africa 1899-1901, was mentioned in despatches, and appointed a Companion of the Distinguished Service Order (DSO) for his services in November 1900.
- Leigh Rayment's Historical List of MPs – Constituencies beginning with "H" (part 4)
- FENWICK, Colonel Henry Thomas’, Who Was Who, A & C Black, an imprint of Bloomsbury Publishing plc, 1920–2008; online edn, Oxford University Press, Dec 2007
- "No. 26311". The London Gazette. 29 July 1892. p. 4306.
- Craig, F. W. S. (1989) . British parliamentary election results 1885–1918 (2nd ed.). Chichester: Parliamentary Research Services. p. 270. ISBN 0-900178-27-2.
- "No. 27359". The London Gazette. 27 September 1901. p. 6304.
- Hansard 1803–2005: contributions in Parliament by Henry Fenwick
|Parliament of the United Kingdom|
| Member of Parliament for Houghton-le-Spring
1892 – 1895
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